20969494 has 48 divisors (see below), whose sum is σ = 40386528. Its totient is φ = 7951104.

The previous prime is 20969489. The next prime is 20969497. The reversal of 20969494 is 49496902.

It is a self number, because there is not a number n which added to its sum of digits gives 20969494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20969497) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152994 + ... + 153130.

It is an arithmetic number, because the mean of its divisors is an integer number (841386).

Almost surely, 2^20969494 is an apocalyptic number.

20969494 is a deficient number, since it is larger than the sum of its proper divisors (19417034).

20969494 is a wasteful number, since it uses less digits than its factorization.

20969494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 20969494 is about 4579.2460078052. The cubic root of 20969494 is about 275.7587596575.

The spelling of 20969494 in words is "twenty million, nine hundred sixty-nine thousand, four hundred ninety-four".